Calculus: The Language of Change: .

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Professor Cohen is a Professor of Mathematics at Smith College. He received his PhD in Mathematics from the University of New Hampshire, and has held posts at Uppsala University, Sweden; Berne University, Switzerland; IHES, Paris; and University of Lyon, France. His research fields include quantum logic, the philosophy of physics, and mathematics education. He is the author or co-author of three books and numerous articles in his fields of research, and he holds the Sherrerd Prize for distinguished teaching at Smith College. He's a licensed pilot, an amateur film maker, and enjoys fine food. He's married and has two daughters.

Professor Henle is a Professor of Mathematics at Smith College. He received his PhD in Mathematics from M.I.T. in 1976. He is the author or co-author of three books and over forty research papers. His work is principally in combinatorial set theory, but touches on geometry, number theory, economics, philosophy of mathematics, and mathematics education. He is a member of the Northampton Woodwind Quintet. Additional interests include politics and fine food. He is married, has a son, and two grandchildren, and lives in Northampton, MA.